Photocatalytic Degradation of Methylene Blue and Methyl Orange Using Aloe Vera-Modified TiO? Under UV and Solar Irradiation

Dr Bolie Therattil

Abstract: This study investigates the photocatalytic degradation of two organic dyes, Methylene Blue (MB) and Methyl Orange (MO), using aloe vera-modified titanium dioxide (TiO₂) as a photocatalyst under both UV and solar irradiation. The modification of TiO₂ with aloe vera extract through high-temperature calcination at 850°C for 2 hours was employed to enhance photocatalytic activity. Experimental results demonstrated that 0.75 g of modified TiO₂ achieved the highest degradation efficiencies: 91% for MB and 75% for MO under sunlight exposure for 1 hour. The study also compared the performance of TiO₂ and TiO₂/ZnO composites applied as paste coatings on beaker walls, which showed reduced efficiency (45-55% for MB, 27-34% for MO) due to light shielding effects. These findings align with established literature on TiO₂-based photocatalysis and demonstrate the potential of bio-modified photocatalysts for sustainable wastewater treatment applications. The degradation followed pseudo-first-order kinetics, with optimal performance observed at higher catalyst concentrations and direct catalyst-dye contact.

Keywords: photocatalytic degradation, solar irradiation, photocatalysis, shielding effects

How to Cite?: Dr Bolie Therattil, "Photocatalytic Degradation of Methylene Blue and Methyl Orange Using Aloe Vera-Modified TiO? Under UV and Solar Irradiation", Volume 15 Issue 7, July 2026, International Journal of Science and Research (IJSR), Pages: 1502-1510, https://www.ijsr.net/getabstract.php?paperid=SR26713193557, DOI: https://dx.doi.org/10.21275/SR26713193557

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